| [GMCnet] Exhaust system supports [message #78276] |
Sun, 28 March 2010 12:00  |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
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I just finished pulling my frame apart and was looking at how the exhaust
system is supported. How many rubber support grommets were installed at the
factory? My coach only had 2. Since I will be going to a 3" exhaust and
relocating the front cross member to accommodate a 3rd fuel tank, I was
thinking that 3 supports might be better. Anyone know if the Jims sell the
grommet and flange?
Thanks,
Les Burt
Montreal
1975 Eleganza II 26ft
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Exhaust system supports [message #78285 is a reply to message #78276] |
Sun, 28 March 2010 12:40  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Coaches only came with 2 of the donuts. You don't need an extra for
the 3"
J.R. Wright
GMC GreatLaker
TZE Zone Restorations
77 Eleganza Custom (For Sale)
1975 Avion (Under Reconstruction)
Michigan
On Mar 28, 2010, at 1:00 PM, Les Burt wrote:
> I just finished pulling my frame apart and was looking at how the
> exhaust
> system is supported. How many rubber support grommets were installed
> at the
> factory? My coach only had 2. Since I will be going to a 3" exhaust
> and
> relocating the front cross member to accommodate a 3rd fuel tank, I
> was
> thinking that 3 supports might be better. Anyone know if the Jims
> sell the
> grommet and flange?
>
>
>
> Thanks,
>
> Les Burt
>
> Montreal
>
> 1975 Eleganza II 26ft
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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GMCnet mailing list
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Exhaust system supports [message #78286 is a reply to message #78276] |
Sun, 28 March 2010 12:54 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
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When I installed Jim's 3" exhaust, he said not to bother even replacing the donuts that were there as mine were not in all that bad shape. I'd say just use what the factory did, and you should be fine.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] Exhaust system supports [message #78291 is a reply to message #78286] |
Sun, 28 March 2010 13:14 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
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I'm moving the front crossmember forward to accommodate a 3rd fuel tank,
which makes the straight section of the exhaust where it runs along the
frame rail longer than original. I was wondering if installing a third
support in the first crossmember would be a help or a hindrance. The 3"
tubing doesn't have much clearance where it passes through the frame.
Thanks,
Les Burt
Montreal
1975 Eleganza II 26ft
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Exhaust system supports [message #78295 is a reply to message #78291] |
Sun, 28 March 2010 13:46 |
Dennis S
Messages: 3046
Registered: November 2005
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Les,
When I did a 3 inch exhaust system JimK did not handle the red grommets nor the metal brackets -- but I see that DanG mentions they are available. I ordered the grommets from Cinnabar. At that time no one offered the brackets.
Here is a link to a photo of new brackets fabricated from stainless..
http://www.cathy-ron.com/SlideShow_assets/SlideShow.html?lang=en
In addition to the grommets and brackets -- you should also have a strap hanger on the Y pipe at the rear of the two mufflers. Just FYI, the earliest 73 coaches did not have the grommets but used strap hangers in those locations.
When Arch was involved with some 3 inch system installs he thought about splitting the bracket/grommet assembly to ease installation but I do not know how far his work went. The frames do not align well on all coaches and it is a very snug fit for the 3 inch long pipe.
Dennis
Dennis Sexton
73 GMC 230
Germantown, TN
USA
-----Original Message-----
From: Les Burt <burtco99@yahoo.com>
To: gmclist@temp.gmcnet.org
Sent: Sun, Mar 28, 2010 1:14 pm
Subject: Re: [GMCnet] Exhaust system supports
I'm moving the front crossmember forward to accommodate a 3rd fuel tank,
hich makes the straight section of the exhaust where it runs along the
rame rail longer than original. I was wondering if installing a third
upport in the first crossmember would be a help or a hindrance. The 3"
ubing doesn't have much clearance where it passes through the frame.
Thanks,
es Burt
ontreal
975 Eleganza II 26ft
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MCnet mailing list
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Exhaust system supports [message #78747 is a reply to message #78299] |
Wed, 31 March 2010 13:59 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Senior Member |
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I think I'll go ahead and install the third support. I was worried that it
might cause more transmission of exhaust vibration into the chassis. Since
it has been stated that the frame holes are not perfectly aligned, I am now
more worried about an unsupported exhaust rattling against the frame.
Now all I need is to find someone with a spare exhaust support grommet and
flange. If I can't find one used, I'll buy new from Jim.
Thanks,
Les Burt
Montreal
1975 Eleganza II 26ft
_______________________________________________
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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